Michael Gafoor, director of the Alcohol and Drug Service, said: "This is one of the most dangerous synthetic cannabinoids that we have seen in Jersey so far because of the unpredictable and potentially fatal effects it can have."

He said if users were going to use a street drug, they should not do so alone, start with a low dose, not mix it with other substances including alcohol and if they feel unwell they should seek medical help immediately.